Model-Based General Arcing Fault Detection in Medium-Voltage Distribution Lines
Model-Based General Arcing Fault Detection in Medium-Voltage Distribution Lines
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DOI：
10.1109/tpwrd.2016.2518738
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发表时间：
2016-01
影响因子：
4.4
通讯作者：
Wenhai Zhang;Y. Jing;Xianyong Xiao
中科院分区：
文献类型：
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作者：
Wenhai Zhang;Y. Jing;Xianyong Xiao
电弧故障是中压配电线路中的一种特殊故障，它可能引起触电、设备故障和火灾。由于其持续时间短或故障电流小，配电线路中的电弧故障的检测是非常具有挑战性的。本文提出了一种基于模型的通用检测方法，将电弧故障与常见的非电弧干扰分离开来。首先，电弧故障模型和非电弧干扰模型的干扰特性，负载参数，变电站电压和电流波形的推导。为了保证模型的准确性，考虑了配电线路上的电压降。然后介绍了电弧故障检测的步骤，包括扰动电流计算、参数估计、均方误差计算和决策。当测量的电压和电流信号与电弧故障模型的匹配比与非电弧干扰模型的匹配更好时，电弧故障被声称。该方法进行了测试，修改后的标准测试系统，考虑不同的故障位置和场景，使用PSCAD/EMTDC。仿真结果表明，该方法具有较高的检测精度，对故障距离、故障电阻、负载电流和采样率具有较强的鲁棒性。实验室实验也进行了进一步验证所提出的方法。
Arcing fault is a special fault in medium-voltage distribution lines which can potentially cause shock hazard, apparatuses failure, and wild fire. Due to its short duration or low fault current, the detection of an arcing fault in distribution lines is highly challenging. In this paper, a model-based general detection method to separate an arcing fault from common nonarcing disturbances is proposed. First, an arcing fault model and a nonarcing disturbance model relating the disturbance characteristics, the load parameters, and the substation voltage and current waveforms are derived. For the accuracy of the models, the voltage drop on the distribution line is taken into consideration. Then, the procedure of arcing fault detection is introduced, including disturbance current calculation, parameters estimation, mean-square-error calculation, and decision making. An arcing fault is claimed when the measured voltage and current signals match the arcing fault model better than the nonarcing disturbance model. The method is tested on a modified standard test system using PSCAD/EMTDC considering different fault locations and scenarios. Simulation results show that the proposed detection method has high accuracy and is robust to fault distance, fault resistance, load current, and sampling rate. Laboratory experiments are also conducted to further validate the proposed method.